Safety ski binding

ABSTRACT

The device includes two elements holding the ends of a ski boot, a first element being integral with a supporting element adapted to rotate between two positions in relation to the base plate of the ski binding: a first high position which involves raising the first element and disengaging the holding element from the boot so that it may move freely, a second low position which involves locking the first element to the base plate of the binding by means of a locking system while the holding element is stopped against the boot so that it is stationary in relation to the ski. The first element is also adapted to move substantially longitudinally in relation to the base plate to which this second movement locks it irreversibly so that the supporting element cannot be released from the base plate as long as the ski boot is in place in the ski binding.

United States Patent Salomon 1 Aug. 19, 1975 [54] SAFETY SKI BINDING 115.870 (1/1961 Germany 280/1135 K 300.634 8/1954 Switzerland .4 280/1135 E [761 Gmrges Joseph 34 1.1 .985 10119:: France 2110/1 1.35 R

Avenue de Loverchy Annecy France Primary lint!nUu'r--Tryg\'e M. BliX 122] Filed: June 28. 1973 Autumn lixumiitar-Sherman D Basinger [21] Appl. No.: 374,623 1 ABSTRACT The device includes two elements holding the ends of 130] Foreign Appllcafio" Prior) Dam a ski boot, a first element being integral with a sup- Jul 3 1972 F me N 7121975 porting element adapted to rotate between two positions in relation to the base plate of the ski binding: a [521 US. Cl /1 E first high position which involves raising the first ele- [51] Int. Cl. Able 9/08 ment and disengaging the holding element from the [58] Field 01" Search ...Z80/1 1.35 E. l 1.35 Ytl 1.35 K. hoot so that it may move freely. a second low position 2811/1135 R 11.35 D. 11.35 A which involves locking the first element to the base plate of the binding by means of a locking system [561 References Cited while the holding element is stopped against the boot UNITED STATES PATENTS so that it is stationary in relation to the ski. The first 3145028 WWW Cuhherl ZHWI '35 K element is also adapted to move suhstantiall longitu- 3 |q7323 7/|%5 Marcus; 3mm R dina11 in relation to the base plate to which this sec- 3.244 431 4/1966 Hatlapa lain/Has E ond mmement locks it irreversibly so that the sup- 3Altlfi68 11/1968 Wile 444444 280111.35 1\' porting element cannot be released from the hase 375M191 8/1973 Fend 281111135 K plate as long as the -ski hoot is in place in the ski hind FOREIGN PATENTS OR APPLICATIONS 481.662 12/1969 German .1 3x1111 11 .15 Y 15 Claims. 12 Drawing Figures 1 I 3 t v 1% 2, 22 4 6 PATENTEDAUGI 9l975 SHiET 1 OF 3 PATENTEUAUGIQISYS 4 3,900,206

FmAa fi'asa SAFETY SKI BINDING The invention relates to a device for automatically putting a ski on again. More particularly. it relates to safety bindings that include a bootholding element. such as a jaw. mounted on a supporting clement arranged to rotate about an axis perpendicular to the vertical and longitudinal planes of symmetry of the ski.

In bindings of this kind. the supporting clement moves between two positions:

a first position. in which the supporting element of the holding element is raised;

a second low position in which the supporting element is locked to the base plate of the binding by a locking system.

German patent application No. l.478.l l9 filed June 28. l965 describes a binding of this kind. The bootholding element consists of a hall moving in a cylindrical channel located in the rocking supporting element. This ball. retained by a spring. comes to rest in a socket arranged in an element integral with the boot.

In putting on his skis. the skier places his boot in the binding in a manner such that the sole bears against a pedal integral with the rocking supporting element.

Under the skiers weight. the supporting element rocks and locks against a lever arranged to pivot on the base plate. which is used when it is desired to remove the ski. During this rotary movement. the ball engages in the socket and locks the boot to the ski.

This type of binding has various disadvantages. in addition to its complexity. For instance. it has no return spring. and the releasing load therefore varies with the length of the boot or with the bending of the ski as it passes over a hollow in the ground.

The binding according to the invention makes it possible to overcome this major disadvantage. and it has other advantages which will be set forth hereinafter.

According to one characteristic of the invention. the rocking element carrying the holding element is also adapted to move substantially longitudinally in relation to the base plate to which this second movement locks it irreversibly. The supporting element cannot therefore be released from the base plate by the skier. as long as the boot is in place in the binding.

According to another characteristic of the invention. the locking system which locks the supporting element to the base plate is preferably a substantially horizontal lug integral with the base plate. under which the curved ends of an element integral with the supporting clement engage when the holding clement moves longitudinally.

According to another important characteristic of the invention. the spring system urging the supporting element to move longitudinally is the release spring of one and/or the other of the holding elements. The skier moves the supporting element into the second position by means of a pedal integral therewith or titted to the sole of the boot. by pivoting his foot around the end of the boot which is stoppcd against the second holding clement.

Moreover. according to another characteristic of the invention. the first boot-holding element is stopped against an element integral with the sole of the boot for a position of the supporting element close to the second position. so that the spring system urging the supporting element to move longitudinally is compressed when the skier pivots his foot.

It should be noted that the device according to the invention for putting the ski on again may be combined with other ski-hoot bindings. More particularly. when the boot is temporarily integral with a plate. the bevelled edge of the plate may engage under a catch integral with the supporting element.

Furthermore. the device according to the invention may be combined with the safety release described by the Applicant in his patent application filed in the USA on May 8. I973 under Ser. No. 358.329.

The holding element comprises two crossed lateral levers held against the end of the boot by a spring system located on the longitudinal axis of the ski; it is characterized in that the releasing load is substantially independent of the length of the boot and therefore of any bending of the ski. It is emphasized that this holding element may be mounted on the supporting ele ment which is adapted to move in translation and to rotate.

The bindings according to the invention are fitted with a pedal like that provided for a stcp in" heel piece. or this function may be carried out either by the under-surface of the plate or an extension thereof. or by the under-surface of the sole extending beyond the end of the plate fitted to the boot.

The device according to the invention thus makes it possible to provide bindings which are particularly simple. rugged. and easy to use and which may be used in conjunction with known holding elements.

Variants of a binding according to the invention will now be described. by way of example. with reference to the drawing. wherein:

FIG. 1 is a perspective of a binding from which the boot has been removed;

FlG. 2 is a sectional view of the device. with the boot removed;

FIG. 3 is a sectional view of the device in the operative position;

FIGS. 30. 311. 3r are diagrammatic views showing the moving parts of the binding in different positions;

FIGS. 41:. 4h, 4r' are sectional detailed views of the slot and the axis of rotation of the supporting element in different positions;

FIGS. 5a. 5/). 51- are sectional detailed views of the profile of the supporting element co-operating with the ramps on the base plate. according to an example of embodiment other than that shown in FIGS. 41!. 4b. 40.

FIG. 1 is a perspective view of a binding in the inoperative position. This is a plate binding in which plate 1. as is known. is temporarily secured to the boot by elements 2 and 12. A base plate 7 is secured to the ski 3 by means of screws 4. The supporting element 5 of a first holding element 8 is foldable and displaceable in translation in relation to base plate 7. these movements taking place about an axis 6 integral with the latter. The holding element 8 is in the form of a catch under which bevelled end 9 of plate I engages in the locked position.

hi the lowered position. and after being displaced longitudinally. bent end 23. located at the front of supporting element 5. engages under a substantially horizontal lug 22.

End 12 of plate 1 abuts against a second holding element 13 of the type described by the Applicant in his above-mentioned application; one of the lateral levers 14 may be recognized.

FIG. 2 shows a sectional view of the device according to the invention along the longitudinal and vertical planes of symmetry of the ski. Most of the elements described in connection with FIG. I will be recognized again. Base plate 7 of the binding is secured to the ski by screws 4. Supporting element 5 is shown in the raised position. The forward end of the supporting ele ment is in the form of a catch 8 under which bevelled end 9 of plate 1. which is secured to boot 15. engages. This catch 8 holds one end of the boot vertically and laterally.

Supporting element 5 has a slot 16 engaging as axis l7 integral with the base plate and perpendicular to the vertical and longitudinal planes of symmetry of the ski. Supporting element 5 may thus pivot about this axis and. according to one characteristic of the invention. may also move longitudinally. It will be seen that. in certain variants, the movement of the supporting element comprises a sequence consisting of a movement of rotation followed by a movement of translation. whereas in other variants the movement is a combination of a movement of rotation and a movement of translation.

it should be noted that the relative positions of slot 16 and axis 17 may be reversed, i.e. axis 17 may be integral with the supporting element. while slot 16 is formed in the base plate.

A spring. one end of which rests against ski 3 while the other end rests on supporting element 5. urges the latter into the raised position.

In order to lower supporting element 5. the skier presses with the sole of his boot on the forward end I) of supporting element 5. the front end of his boot being up against the second holding element located in front.

In the example of embodiment illustrated in FIG. 2. the skier applies pressure to supporting element 5 by means of a pedal 20 secured to plate 1. This design is particularly suitable for bindings comprising a plate which is larger than the sole of the boot. The outer face of the supporting element is provided with a recess 21 which accommodates pedal 20 after the skier has put the ski on again.

If the device according to the invention is attached to the front of the boot. the situation is reversed. The skier applies pressure to the supporting element with the front end of his boot. with the heel of his boot up against the heelpiece.

The rear end of supporting element 5 has a rounded profile 26 co-operating with the base plate in a manner such that the pivoting movement of supporting element 5 'may be:

- a movement of rotation only;

a movement of rotation followed by a combined movement of rotation and translation.

- a movement combining rotation and translation.

The front end of the base plate has a sloping ramp 24 on each side. This ramp co-operates with profile 25 at the front end of the supporting element in a manner such that the mobile supporting element is guided in a movement which is substantially one of longitudinal translation when the element is in its lower positions. especially when rounded profile 26 no longer cooperates with the base plate. The direction of the movement of longitudinal translation is opposite to that of the movement of translation causing the mobile element to be locked to the base plate. The first translation brings about an increase in tension in second holding element 13. while the second translation, producing the locking effect, is achieved as a result of prior compression of second holding element 13. The cooperation between ramps 24 and 25 also has the effect of permitting translation only after one complete rotation of the supporting element.

FIG. 3 is a sectional view in the vertical and longitudinal planes of symmetry of the ski. The supporting element is irreversibly locked to the base plate. the bentback end 23 of the supporting element being engaged under lug 22 which is substantially horizontal and is integral with the base plate. It cannot. therefore. be released by a force of the same intensity. but acting in the opposite direction, as the force producing the locking effect. which acts in a downward direction, and is sub stantially equal to the skiers weight. The force making is possible to unlock the supporting element must of necessity have at least one component acting along the longitudinal axis of the ski.

Bevelled end 9 of plate I is engaged under catch 8 which is integral with supporting element 5. Thus the boot. temporarily secured to plate 1. is locked to the ski.

It should be noted that the supporting element is locked irreversibly to the base plate. and that it cannot be unlocked or raised by the skier while his boot is in place in the binding. In order to release the boot from the binding. the skier must move levers 14 of the second holding element away from the boot. as described in the above-mentioned application. In order to take the ski off, the skier may also unlock device 2, which secures the boot to plate I, which is locked to the ski.

The skier may also remove his skis when he falls. At the time of a fall, bevelled rear end 9 of plate 1 is released. under vertical or longitudinal loading, from the corresponding bevelled portion of catch 8, sliding forwardly and upwardly on the latter and compressing spring 13 of the second holding element through plate I and levers 14. It will be seen that the release ramp of bevelled rear part 9. which determines the resilient course prior to release. occupies substantially the entire thickness of the plate. which is also that of the automatic device for putting the ski on again. Thus the release ramp in the binding according to the invention takes up all the available space; this is an important advantage. the thickness of the plate being of necessity limited since it is located under the boot.

It should be noted. moreover. that the supporting element is of necessity locked to the base plate during the release of the safety device at the time ofa forward fall. under the action of a vertical load. After the boot has left the binding. the supporting element may be unlocked by its own weight, but in no case can it be unlocked until the boot has been completely released.

The supporting element may. however. remain locked to the base plate without the boot being in place. especially if the skier removes his ski voluntarily and manually at the time of a fall. In this case. the skier may very easily unlock the supporting element by pushing it towards the front of the ski. particularly with his foot. To this end. plate 1. which is secured to the boot. is provided with a catch 28'. in order to unlock the supporting element. the skier, after moving his foot to the rear. hooks the rear 29 of the supporting element with catch 28.

The operation of a device according to the invention for putting skis on again will now be described in conjunction with FIGS. 31:. 3h. 3: which illustrate schematically the various positions occupied by the moving parts of the device. and the way in which the profiles and ramps co-operate.

Supporting element 5 pivots about axis 17 integral with ski 3. Rear end 9 of plate I. attached to the boot. acts as a pedal and co-operates with front end 19 of supporting element 5. Front end of plate I is up against the holding element located at the front of the binding. This element, holding front end 30 of plate I, is actuated, as is known. by a spring system 3] resting on the ski at 32.

When the skier engages his foot in the binding (FIG. 3a), rear end 9 of plate 1 comes up against front end 19 of the supporting element. especially for positions near the low position (otherwise known as the second position). The skiers boot pivots about its front end 30 which is up against the second holding element located at the front end of the binding; during this movement.

spring 31 is compressed because rear end 26 of supporting element 5. guided by the ramp integral with the ski. cannot retreat. When rear end 26 ceases to cooperate with the ramp integral with the ski or with the base plate. the supporting element is in the lowered position (FIG. 3b); the front end 19 thereof then cooperates with ramp 24, and spring 3] continues to be compressed. When front end I9 of the supporting element passes over lug 33, plate I moves backwards under the action of spring 3I which has been previously compressed, as described above. In the course of this movement. plate I carries along supporting element 5. the front end of which engages under lug 22. thus locking the plate and boot to the ski. as described in conjunction with FIG. 3.

It should be noted that the holding element. actuated by release spring 31, may be mounted on supporting element 5. In this case the front end of the boot is at a fixed stop. and rear end 9 of plate l compresses the spring by means of the holding element. It should be noted that in this case the plate remains stationary during the locking phase. since it is the element supporting the holding element which moves in translation in relation to the ski; the holding element itself remains in Contact with the boot or the piece fitted thereto.

It is also possible to provide an independent spring to urge the supporting element towards the rear when it is in the locking position.

A description will now be given of variants of the ramps and sections guiding the movements of rotation and translation of the supporting element (FIGS. 40. 4b. 4c and 50. 5h, 5c).

FIGS. 40. 4b. show three sectional detailed views of slot 40, supporting element 5. and axis 41 integral with base plate 7. The rear end of supporting element 5 has a cylindrical profile 42 co-operating with a second cylindrical ramp 43 integral with the base plate. These two cylindrical surfaces are co-axial with axis of rotation 41 (FIG. 4a). and supporting element 5 therefore pivots about this axis in the direction of arrow 45. Before supporting element 5 reaches its low position. i.e. before point 48 passes point 47, slot 40 slides on axis 41. The supporting element thus moves forward first of all. in the direction of arrow F (FIG. 4b), as a result ofco-operation between ramps 24 and 25; it then moves backwards in the direction of arrow 46 (FIG. 40). under the action of the release spring associated with the holding element securing the front end of the boot. A stop 44 restricts the travel of supporting element 5 as it rises.

It should be noted that the movement in the direction of arrow F prevents wear in points 48 and 47. since these never come into contact on a reduced surface. In theory. by reason the movement in the direction of arrow F. the compression of the aforesaid release spring should be enough to cause locking by movement in the opposite direction (arrow 46). In practice. however. it is desirable to import a greater amount of compression to this spring when the holding element is lowered. in order to provide a better foothold. Thus the spring will remain compressed after the movement in the direction of arrow 46.

FIGS. 5a. 5b. 51' show three detailed. sectional views of a variant of slot of supporting element 5. and of axis SI integral with base plate 7. Slot 50 has two distinct parts. namely:

- a cylindrical part 52 co-operating with cylindrical surface 53 of axis SI (FIG. 5a);

a straight part co-operating with two flats on axis SI (FIG. 51').

When supporting element 5 is raised. cylindrical surfaces 52. 53 co-operate in a manner such that the sup porting element pivots about axis 51 in the direction of arrow 36 (FIG. 511). When the supporting element is in its low position. the substantially horizontal and straight flats SS. 54 co-operate to make the movement of the supporting element substantially horizontal.

Having now set forth the invention and justified its interest by means of detailed examples. the Applicant reserves himself exclusive rights thereto for the entire life of the patent. with no restrictions other than those in the following claims.

I claim:

I. A safety binding for skis for putting on a ski automatically comprising:

a. first and second releasable holding elements binding the ends of a ski boot;

b. a supporting element adapted to tilt up and down and to move substantially longitudinally in relation to a base plate secured to the ski. said supporting element being integral with and supporting said first holding element;

c. an irreversible locking system intercalated between said base plate and said supporting element; said supporting element being movable between two positions; said supporting element being irreversibly locked by said irreversible locking system when the boot is in place in the binding; a first high position for which said first holding element is raised and disengaged from the boot. a second low position for which said supporting element is locked to said base plate by said locking system while said supporting element moves substantially longitudinally and for which said first holding element is in abutment against the boot. said second position being obtained when a skier puts on a ski by pivoting his foot about the end of the boot associated with said second holding element; and by pressing the opposite end of the boot against said supporting element;

d. a system of springs urging said supporting element in a substantially longitudinal movement. said springs being compressed as a result of the skier pivoting his foot; said longitudinal movement being towards the rear if the boot pivots about the front end thereof.

2. A safety binding for skis, according to claim I, said supporting element being urged into said first position by a spring, one end of which bears against said base plate while the other end bears against said supporting element.

3. A safety binding for skis for putting on a ski automatically comprising:

a. a base plate secured to the ski,

b. a supporting element adapted to tilt up and down and to move substantially longitudinally in relation to said base plate.

c. a releasable holding element for binding one end of a ski boot.

(1. a releasable catch holding the other end of said boot, said catch being integral with said supporting element,

e. an irreversible locking system intercalated between said base plate and said supporting element; said supporting element being movable between two positions:

a first high position for which said catch is raised and disengaged from a bevelled release ramp fitted to the sole of the boot. and

a second low position for which said supporting element is irreversibly locked to said base plate by said irreversible locking system when the boot is in place in the binding and for which said catch cooperates with said bevelled release ramp fitted to the sole of the boot; said second position being obtained when a skier puts on a ski by pivoting his foot about the end of the boot which is against said holding element, and by pressing the opposite end of the boot against said supporting element;

a system of springs urging said supporting element in a substantially longitudinal movement, said springs being compressed as a result of the skier pivoting his foot; said longitudinal movement being towards the rear if the boot pivots about the front end thereof.

4. A safety binding for skis, according to claim 3, said locking system consisting of a substantially horizontal lug integral with said base plate; a bent-back end of an element integral with said supporting element engaging under said lug while said supporting element is moving longitudinally.

5. A safety binding for skis. according to claim 3.. said locking system consisting of a substantially horivontal lug integral with said base plate. said lug engaging an element integral with said supporting clement while the latter is moving longitudinally.

6. A safety binding for skis. according to claim 5, said holding element comprising a release spring capable of being compressed by longitudinal displacement of the boot; said system of springs. acting upon said supporting clement through the boot. consisting of the release spring of the holding element.

7. A safety binding for skis. according to claim (1. said catch engaging against an element fitted to the sole ol the boot when the supporting element is in the vicinity of said second position. whereby said springs acting upon said supporting element are compressed when said supporting element is in the vicinity of said second position.

8. A safety binding for skis, according to claim 7, said supporting element comprising at least one profile cooperating with a ramp integral with said base plate and guiding said supporting element in movements of rotation and translation.

9. A safety binding for skis, according to claim 7, said element fitted to the sole of the boot comprising a catch engageable with the rear of said supporting element. whereby said supporting element moves forward 10 when the skier pushes it with his boot in order to unlock it.

10. A safety binding for skis, according to claim 7, said supporting element comprising a slot engaging an axis of rotation mounted on said base plate, whereby said supporting element is mobile in longitudinal translation.

11. A safety binding for skis, according to claim 10, wherein a profile located at the front of said supporting element cooperates with a first ramp integral with said base plate, in a manner such that said supporting element is guided in a substantially longitudinal movement for positions close to said second position, the direction of said longitudinal movement being opposite to that of the movement producing the locking of said supporting element under the action of the system of springs acting thereupon.

12. A safety binding for skis, according to claim 1], said supporting element comprising a second profile located at the rear and cooperating with a second ramp integral with said base plate, in a manner such that said supporting element is guided in a movement of rotation.

13. A safety binding for skis according to claim l2,

the said second profile integral with the supporting element being situated in said slot and consisting of two parts;

a substantially cylindrical surface co-axial with same axis of rotation;

' a substantial flat surface;

the said second ramp integral with the base plate being situated on the axis of rotation consisting of two distinct parts: a substantially cylindrical surface co-axial with axis of rotation and, a substantially flat surface the two substantially cylindrical surfaces being concentric and having the same radius. the substantially flat surface integral with the axis of rotation being parallel with the ski plane.

14. A safety binding for skis. according to claim 12, the profile integral with the rear of said supporting element ceasing to cooperate with said second ramp integral with said base plate when the profile on the front part of the supporting element cooperates with the first ramp integral with the base plate.

IS. A safety binding for skis according to claim 12.

said second profile integral with said supporting element consisting of a substantially cylindrical surface coaxial with said axis of rotation.

said second ramp integral with the base plate consisting of a substantially cylindrical surface co-axial with said this of rotation. the two substantially cylindrical surfaces being concentric and having the same radius.

l= l =l 

1. A safety binding for skis for putting on a ski automatically comprising: a. first and second releasable holding elements binding the ends of a ski boot; b. a supporting element adapted to tilt up and down and to move substantially longitudinally in relation to a base plate secured to the ski, said supporting element being integral with and supporting said first holding element; c. an irreversible locking system intercalated between said base plate and said supporting element; said supporting element being movable between two positions; said supporting element being irreversibly locked by said irreversible locking system when the boot is in place in the binding; a first high position for which said first holding element is raised and disengaged from the boot, a second low position for which said supporting element is locked to said base plate by said locking system while said supporting element moves substantially longitudinally and for which said first holding element is in abutment against the boot, said second position being obtained when a skier puts on a ski by pivoting his foot about the end of the boot associated with said second holding element; and by pressing the opposite end of the boot against said supporting element; d. a system of springs urging said supporting element in a substantially longitudinal movement, said springs being compressed as a result of the skier pivoting his foot; said longitudinal movement being towards the rear if the boot pivots about the front end thereof.
 2. A safety binding for skis, according to claim 1, said supporting element being urged into said first position by a spring, one end of which bears against said base plate while the other end bears against said supporting element.
 3. A safety binding for skis for putting on a ski automatically comprising: a. a base plate secured to the ski, b. a supporting element adapted to tilt up and down and to move substantially longitudinally in relation to said base plate, c. a releasable holding element for binding one end of a ski boot, d. a releasable catch holding the other end of said boot, said catch being integral with said supporting element, e. an irreversible locking system intercalated between said base plate and said supporting element; said supporting element being movable between two positions: a first high position for which said catch is raised and disengaged from a bevelled release ramp fitted to the sole of the boot, and a second low position for which said supporting element is irreversibly locked to said base plate by said irreversible locking system when the boot is in place in the binding and for which said catch cooperates with said bevelled release ramp fitted to the sole of the boot; said second position being obtained when a skier puts on a ski by pivoting his foot about the end of the boot which is against said holding element, and by pressing the opposite end of the boot against said supporting element; f. a system of springs urging said supporting element in a substantially longitudinal movement, said springs being compressed as a result of the skier pivoting his foot; said longitudinal movement being towards the rear if the boot pivots about the front end thereof.
 4. A safety binding for skis, according to claim 3, said locking system consisting of a substantially horizontal lug integral with said base plate; a bent-back end of an element integral with said supporting element engaging under said lug while saiD supporting element is moving longitudinally.
 5. A safety binding for skis, according to claim 3, said locking system consisting of a substantially horizontal lug integral with said base plate, said lug engaging an element integral with said supporting element while the latter is moving longitudinally.
 6. A safety binding for skis, according to claim 5, said holding element comprising a release spring capable of being compressed by longitudinal displacement of the boot; said system of springs, acting upon said supporting element through the boot, consisting of the release spring of the holding element.
 7. A safety binding for skis, according to claim 6, said catch engaging against an element fitted to the sole of the boot when the supporting element is in the vicinity of said second position, whereby said springs acting upon said supporting element are compressed when said supporting element is in the vicinity of said second position.
 8. A safety binding for skis, according to claim 7, said supporting element comprising at least one profile cooperating with a ramp integral with said base plate and guiding said supporting element in movements of rotation and translation.
 9. A safety binding for skis, according to claim 7, said element fitted to the sole of the boot comprising a catch engageable with the rear of said supporting element, whereby said supporting element moves forward when the skier pushes it with his boot in order to unlock it.
 10. A safety binding for skis, according to claim 7, said supporting element comprising a slot engaging an axis of rotation mounted on said base plate, whereby said supporting element is mobile in longitudinal translation.
 11. A safety binding for skis, according to claim 10, wherein a profile located at the front of said supporting element cooperates with a first ramp integral with said base plate, in a manner such that said supporting element is guided in a substantially longitudinal movement for positions close to said second position, the direction of said longitudinal movement being opposite to that of the movement producing the locking of said supporting element under the action of the system of springs acting thereupon.
 12. A safety binding for skis, according to claim 11, said supporting element comprising a second profile located at the rear and cooperating with a second ramp integral with said base plate, in a manner such that said supporting element is guided in a movement of rotation.
 13. A safety binding for skis according to claim 12, the said second profile integral with the supporting element being situated in said slot and consisting of two parts; a substantially cylindrical surface co-axial with same axis of rotation; a substantial flat surface; the said second ramp integral with the base plate being situated on the axis of rotation consisting of two distinct parts: a substantially cylindrical surface co-axial with axis of rotation and, a substantially flat surface the two substantially cylindrical surfaces being concentric and having the same radius, the substantially flat surface integral with the axis of rotation being parallel with the ski plane.
 14. A safety binding for skis, according to claim 12, the profile integral with the rear of said supporting element ceasing to cooperate with said second ramp integral with said base plate when the profile on the front part of the supporting element cooperates with the first ramp integral with the base plate.
 15. A safety binding for skis according to claim 12, said second profile integral with said supporting element consisting of a substantially cylindrical surface co-axial with said axis of rotation, said second ramp integral with the base plate consisting of a substantially cylindrical surface co-axial with said axis of rotation, the two substantially cylindrical surfaces being concentric and having the same radius. 